298 MORPHOLOGY AND EVOLUTION (L.C.N.) nerves, and twigs to the hepatic (H.P.), coronary (Gr.P.), splenic (S.P.), aortic (A.G.C.), superior mesenteric (S.iLP.) and inferior mesenteric (I.M.P.) plexuses. These filaments, however, could not be traced to the caecum or descending colon. FIG- 53.- The abdominal parts of the vagus and sympathetic nerves in the Chimpanzee. Letters explained in text. In the Orang the right vagus communicates with the solar plexus and is distributed to the gut. • Spinal Accessory Nerve.—In the Chimpanzee it perforates the cleido-mastoid muscle and runs deep to it and to the trapezius.